The effects of temperature variation on electron beams with RF voltage modulation

The correlation between the horizontal beam size vs.
the cavity temperature, observed at the Taiwan Light
Source (TLS), is explained by the combined effects of (1)
cavity resonance frequency shift resulting from
temperature change, (2) cavity voltage and synchronous
phase angle change resulting from uncompensated beam
loading in the low-level rf-feedback system, and (3) rf
cavity voltage modulation for alleviating the coupled
bunch instability. This experimental method can be used
to evaluate the intrinsic resolution of the low-level rf-
feedback system.